2# types of estimate

different types of estimates

1. QUANTITY SURVEYING AND VALUATION Lecture #2

2. Types of Estimates ( 1) Preliminary or Approximate estimate (2) Rough cost estimate based on plinth area (3) Rough cost estimate based on cubic contents (4) Detailed estimate (5) Annual repair estimate (6) Special repair estimate (7) Revised estimate ( 8) Supplementary estimate

3. 1. Preliminary or Approximate estimate It is prepared after preliminary investigation and preliminary surveying Detailed surveying, design, drawings etc. are not required Rates are determined either from practical knowledge or from records for similar works For example: To calculate approximate estimate for a Hospital, per bed cost is calculated from the recent completed hospital and is multiplied with the number of beds required.

4. 2 . Rough cost estimate based on plinth area Plinth area of a building shall be determined first Plinth area of a building means Length x Breadth Estimate of a building is calculated by multiplying the plinth area of the building with plinth area rate of the locality for similar buildings. Example T otal cost of a building is Rs . 2 lac and its plinth area is 50 m 2 P linth area rate = 2,00,000/50 = Rs.4000/- per m 2 For a new building plan with 100m 2 , Total cost =4000x100 = Rs.4,000,00/-

5. 3. Rough cost estimate based on c ubic content Plinth area of a building shall be determined first The cubic contents of a building means plinth area x height of the building . Estimate of a building is calculated by multiplying the cubic content of the building with cubic rate of the locality for similar buildings.

6. 4 . Detailed Estimate After getting Administrative approval on rough cost estimate , detailed estimates are prepared Quantities of various items are calculated individually An abstract of cost -giving quantities of each item and rate of every item according to the sanctioned schedule of rates Detailed specifications & report should also be attached with the estimate . Technical sanction is given on detailed estimate

7. 5 . Annual repair estimate To keep building and roads in perfect condition , annual repairs should be carried 1 1/2 % to 2% of the capital cost of the building

8. 6. Special repair estimate If the work cannot be carried out of the annual repair funds due to certain reasons resulting in the genuine increase in cost, then special repairs estimate is to be prepared. Eg . Replastering walls, new doors etc.

9. 7 . Revised estimate If the sanctioned estimate exceeds by 5% either due to the rate being found insufficient or due to some other reasons, a fresh estimate is prepared which is called a Revised Estimate A comparative statement on the last page of the estimate is attached giving there in the reasons of the increase of cost in case of each item.

10. 7 . Supplementary estimate A fresh detailed estimate in addition to the original sanctioned estimate prepared due to some changes in structural design.

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